A student is observing waves in a ripple tank. They notice that 6 complete wavelengths pass a fixed point in 15 s. What is the frequency of these waves?
0.40 Hz0.40\text{ Hz}0.40 Hz
2.5 Hz2.5\text{ Hz}2.5 Hz
9.0 Hz9.0\text{ Hz}9.0 Hz
90 Hz90\text{ Hz}90 Hz
237 exam-style questions on CIE IGCSE Physics General properties of waves, covering General properties of waves. Each one has a worked solution and a mark scheme showing where the marks go.